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clicks is available in Ubuntu. [?]
SuperTux
Classic 2D jump 'n run sidescroller with Tux
30,568 users
KPPP
modem dialer for KDE 4
183,394 users
SagCAD
CAD/CAM of 2D program
12,785 users
LXDE (the Lightweight X11 Desktop Environment)
Meta-package for the Lightweight X11 Desktop Environment
7,562 users
Rawstudio
RAW image converter
18,997 users
Graphical Disk Map
Tool to visualize diskspace
15,939 users
Accerciser
an interactive Python accessibility explorer for the GNOME desktop
4,440 users
CellWriter
grid-entry handwriting input panel
14,045 users
Find Files/Folders
file search utility for KDE 4
348,124 users
CheckGMail
alternative Gmail Notifier for Linux via Atom feeds
45,497 users
Tux Typing
Educational Typing Tutor Game Starring Tux
53,426 users
Translator
Graphical user interface for Apertium
2,814 users
Sudoku
Sudoku number puzzle
384,221 users
gMobileMedia (Mobile Media Browser)
GTK+ application used to browse a mobile phone filesystem
13,417 users
Keep
backup system for KDE
130,901 users
Galaga
X version of the famous Galaga game
12,980 users
Multisync
A program to synchronize PIM data
36,780 users
Ardour GTK2
digital audio workstation (graphical gtk2 interface)
48,951 users
Pidgin Internet Messenger Off-the-Record Plugin
Off-the-Record Messaging plugin for pidgin
792,912 users
Blog Entry Poster
GNOME applet to post to weblog entries
8,586 users